Precautions To Observe When Performing Measurement - GRAPHTEC midi LOGGER GL240 Quick Start Manual

Precautions to Observe When Performing Measurement

Maximum input voltage
If a voltage exceeding the specified value is input, the semiconductor relay in the
input section will be damaged. Never input a voltage exceeding the specified value
even for a moment.
< Between +/– terminals(A) >
• Maximum input voltage: 60Vp-p (Range of 20mV to 1V)
< Between input terminal/input terminal (B) >
• Maximum input voltage: 60Vp-p
• Withstand voltage: 350 Vp-p at 1 minute
< Between input terminal/GND (C) >
• Maximum input voltage: 60Vp-p
• Withstand voltage: 350 Vp-p at 1 minute
Warming-up
GL240 requests to have approximately 30 minutes warm-up in order to have the
specified performance.
Unused channels
The analog input section has high impedance.
If it is open, measured value may vary due to noise.
In such a case, set to "Off" unused channels in the AMP setting menu or short the +
and – terminals.
Noise countermeasures
If measured values fluctuate due to extraneous noise, conduct the following
countermeasures.(Results may differ according to noise type.)
Ex 1 : Connect the GL240's GND to ground.
Ex 2 : Connect GL240's GND to measurement object's GND.
Ex 3 : Operate GL240 with batteries (Option: B-569).
Ex 4 : In the AMP settings menu, set filter to any setting other than "OFF".
Ex 5: Set the sampling interval which enables GL240's digital filter
Number of Measuring
Channels
*1
1 chahnnel or less
2 chahnnels or less
5 chahnnels or less
10 chahnnels or less
*1 Number of Measuring Channels is the number of channels in which input settings are
NOT set to "OFF" .
*2 Temperature cannot be measured when the sampling interval is set to 10 ms/20 ms or 50 ms.
110Vp-p (Range of 2V to 100V)
Allowed Sampling
Interval
10 msec or slower
20 msec or slower
50 msec or slower
100 msec or slower
(see table below).
Sampling Interval which
enables Digital Filter
*2
50 msec or slower
*2
125 msec or slower
*2
250 msec or slower
500 msec or slower
5